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Finding the Fourth Proportional to 70,086.60, 105,129.90 and 68,446.35

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Solution

The fourth proportional to 70,086.60, 105,129.90 and 68,446.35 is: 102,669.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,086.60 : 105,129.90 = 68,446.35 : x
  2. Step 2: Convert to fraction form
    70,086.60/105,129.90 = 68,446.35/x
  3. Step 3: Cross multiply
    70,086.60x = 105,129.90 × 68,446.35
  4. Step 4: Simplify right side
    70,086.60x = 7,195,757,930.87
  5. Step 5: Solve for x
    x = 7,195,757,930.87/70,086.60
  6. Step 6: Final answer
    x = 102,669.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.